Mass Rapid Transit, better known with its acronym "MRT") is a planned 3-line mass rapid transit system in the Greater Kuala Lumpur (part of Klang Valley region) conurbation in Malaysia. It envisages a "wheel and spoke" concept comprising two northwest-southeast radial lines and one circle line looping around Kuala Lumpur.

The MRT lines, when completed, will be operated as components of the Klang Valley Public Transport System.

The "MRT" will not only significantly increase the current inadequate rail network but will also serve to integrate the existing rail networks and alleviate the severe traffic congestion in the Greater KL metropolitan area. The proposal was announced in June 2010 and was approved by the government of Malaysia in December 2010. Construction of the first line commenced in July 2011. The project also represents one of the economic entry point projects identified for the Klang Valley "National Key Economic Area" under the Economic Transformation Programme by the Malaysian government.

The Mass Rapid Transit Corporation Sdn Bhd (MRT Corp), founded in September 2011, has been appointed by the government as the official and asset owner of the project. Prior to the founding of the corporation, the project was managed by Prasarana Malaysia Berhad (Prasarana).

In June 2010, the Prime Minister Najib Razak announced during the tabling of the 10th Malaysia Plan (2011-2015) that the government was studying the MRT proposal for Greater Kuala Lumpur. The original proposal was dubbed the “Klang Valley Integrated Transportation System”, but it is more commonly referred to as the “Greater Kuala Lumpur MRT” or “Klang Valley MRT” by the press and analysts. While the concept plan itself was conceived by a joint venture between Gamuda Berhad and MMC Corporation Berhad, contract awards for the design and construction packages is expected to be tendered out by the government via the Swiss challenge method, if approved. The Gamuda-MMC JV indicated its intention to be the project lead and undertake tunneling works. The newly launched Public Land Transport Commission (SPAD) will oversee and coordinate the entire MRT development in terms of cost and viability, alignment and integration, and will play the role of regulator once the project is completed. National infrastructure company, Prasarana would ultimately own and operate the MRT.

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